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3 years ago

I need help please please

Chemistry

2 answers:

lukranit [14]3 years ago

8 0

The list of strong acids is: HCl, HBr, HI, HClO4, HClO3, HNO3, and H2SO4. Therefore, phosphoric acid H3PO4 is a weak acid. Since the salt of weak acids becomes a strong electrolyte, then K3PO4 is a strong electrolyte.

The first equation just shows dissolution of methanol. the third is for carbonic acid (a weak electrolyte), and the fourth is the dissolution of acetic acid (also a weak electrolyte).

Mrac [35]3 years ago

8 0

Answer:
K₃PO₄......> 3K⁺ + PO₄³⁻

Explanation:
A strong electrolyte if formed from the salt of a weak acids.

From the list of weak acids attached, we can note that H₃PO₄ is a weak acid.
This means that its salt (K₃PO₄) would be a strong electrolyte and would ionize completely in water.

Based on the above, we would choose the second option.

Considering the other options:
Options C and D are weak electrolytes
Option A is only dissolution of methanol.

Hope this helps :)

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The The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k=0.029 W/ m measured temperature differ

vfiekz [6]

Answer:

Heat flux = 13.92 W/m2

Rate of heat transfer throug the 3m x 3m sheet = 125.28 W

The thermal resistance of the 3x3m sheet is 0.0958 K/W

Explanation:

The rate of heat transfer through a 3m x 3m sheet of insulation can be calculated as:

$q=-k*A*\frac{\Delta T}{\Delta X}\\\\q=-0.029\frac{W}{m*K}*(3m*3m)*\frac{12K}{0.025m} =125.28W$

The heat flux can be defined as the amount of heat flow by unit of area.

Using the previous calculation, we can estimate the heat flux:

$heat \, flux=\frac{q}{A}=\frac{125.28 W}{9 m^{2} } =13.92 W/m^{2}$

It can also be calculated as:

$q/A=-k*\frac{\Delta T}{\Delta X}$

The thermal resistance can be expressed as

$\Delta T=R_t*Q\\R_t=\Delta T/Q=\frac{\Delta X}{k*A}$

For the 3m x 3m sheet, the thermal resistance is

$R_t = \frac{\Delta X}{k*A}=\frac{0.025m}{0.029W/mK*9m^{2}}=0.0958 \, K/W$

4 0

4 years ago

Please help this is due today! 5-11-2021

Licemer1 [7]

Answer:

- The chemical reaction is not balanced. There is two oxygens on the reactant's side while there's only one oxygen on the products side.

- I would not say it's following the law of conservation of mass as it's not a balanced equation.

- To balance this equation, you would need to add the coefficient of '2' to Magnesium (Mg) on the reactants side, and add the coefficient of '2' to the products side. This would make it so that there's 2 Mg's and 2 O's on both the reactant's side and products side.

edit: I hope this helped you in some way. ^^

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3 years ago

When water H2O freezes into ice some of the properties have changed but the blank of the H2O is the same.

quester [9]

I would see chemical constitution and physical components are not changed.

Because physical reaction won't change the component itself

6 0

3 years ago

No links

lukranit [14]

From the calculations, the heat that is required is 2.1 kJ.

<h3>What is the specific heat capacity?</h3>

The term specific heat capacity has to do with the amount of heat that must be supplied to 1Kg of a substance in order to raise its temperature by 1K.

In this case;

H = mcdT

H = 100 grams * 4.18 J/gC * (25 - 20)

H = 2.1 kJ

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2 years ago

The energy produced by the snack in an experiment is calculated to be 41,800 J/g. What is the energy of the snack in Calories/

Goryan [66]

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The energy that is contained in a snack is obtained from a calorimeter when the snack is burnt in a calorimeter. The mass of the snack that is burnt is measured in terms of energy output of the calorimeter.

If 1 calorie = 4.18J

x calorie = 41,800 J

x = 41,800 J * 1 calorie/4.18J

x = 9983.3 Calories/gram

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2 years ago